Fish Passage Site 20100713

Coordinates (dec. deg.): 61.75813°, -145.15625°
Legal Description: C001S001E25
Region: South Central
Road Name: Richardson Highway

Datum: NAD83
Quad Name / ITM: Valdez D-4
AWC Stream #:
Stream Name: Rock Creek


Site Comments: MP 86.1

Multiple surveys have been conducted at this site — click on the drop down
arrow to the right of the survey date below to choose a different report for this site.


Project Supervisor: Gillian O'Doherty, ADFG
Observers: Kirsti Jurica

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

  1. Outfall height red
  2. Culvert gradient red

Comments: This assessment was conducted by the Copper River Watershed Project.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Red
Length(ft): 121.3
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.25
Condition Rating(1-5): 4
Approach Angle: 5.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
Width(ft):15.2 14.5
Height(ft):9.62 11.09
Apron Length(ft):
Water Depth(ft): 0.13
Rustline Height(ft):0.75
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.41
Outfall Type: Free Fall In To Pool
Constriction Ratio: 1.8
Culvert Gradient: 4.03%
Max Slope:
Max Slope Length:

Comments: Outlet miter is at an angle and stream riffles across it. Stream slope taken with clinometer.

  Culvert Observations:
  1. Outfall height red
  2. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):3.6
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Downstream ordinary high water 9.70
Downstream ordinary high water 7.10
Downstream ordinary high water 8.50
Upstream ordinary high water 7.20
Upstream ordinary high water 9.50
Upstream ordinary high water 8.10
Upstream ordinary high water 9.70


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Inlet Culvert Top (Top of miter, distance from end of pipe not recorded) 105.44
Road Elev 115.10
Outlet Culvert Top (Top of miter, distance from end of pipe not recorded) 102.02
D/S Grade Ctrl (Thalweg) 0.00 87.27
D/S Water Surface Elev 0.00 87.93
D/S Tailcrest or 1st Thalweg 91.00 90.33
D/S Water Surface Elev 91.00 90.78
Max Pool Depth 106.00 87.33
Outlet Pool Water Elev 106.00 90.65
Outlet Invert 116.00 90.93
D/S Water Surface Elev 116.00 91.06
Inlet Culvert Invert 237.00 95.82
U/S Water Surface Elev 237.00 96.13
U/S Grade Ctrl (Thalweg) 253.00 96.57
U/S Water Surface Elev 253.00 96.91
U/S Grade Ctrl (Thalweg) 323.00 98.81
U/S Water Surface Elev 323.00 99.21
U/S Grade Ctrl (Thalweg) 353.00 100.15
U/S Water Surface Elev 353.00 100.51


  1. River distance is measured continuously throughout the survey reach along the thalweg of the stream.
  2. Measured from each end of the crossing along the thalweg of the stream.

Fish Sampling Efforts

Gear Type: Minnow Trap (A) Trap Duration(h): 19.0
Comments: 3 Traps set upstream.
Gear Type: Minnow Trap (B) Trap Duration(h): 19.0
Comments: 3 traps set downstream

Fish Observations

Species: Arctic grayling Life History: Unknown
Total Fish Observed: 1 Fish Measured: 1 Fork Lengths (mm) Min: 85 Max: 85 Mean: 85
Collected/Observed by Gear Type: Upstream Minnow Trap (1)  

Questions or comments about this report can be directed to